Eirik Drift MIS 11 Marine Sediment Sr-Nd-Pb Isotope Geochemistry Reyes, A.V.; Carlson, A.E.; Beard, B.L.; Hatfield, R.G.; Stoner, J.S.; Winsor, K.; Welke, B.; Ullman, D.J. Reyes, A.V. Carlson, A.E. Beard, B.L. Hatfield, R.G. Stoner, J.S. Winsor, K. Welke, B. Ullman, D.J. earth science/paleoclimate/paleoceanography (87Rb/86Sr,null,null,dimensionless,null,paleoceanography,null,null,N,CaCO3-free silt) earth science/paleoclimate/paleoceanography (87Sr/86Sr,null,null,dimensionless,null,paleoceanography,null,thermal ionization mass spectrometry,N,CaCO3-free silt) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,sediment description) earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (87Sr/86Sr,null,two standard error,dimensionless,null,paleoceanography,null,thermal ionization mass spectrometry,N,CaCO3-free silt) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,geological terrane) earth science/paleoclimate/paleoceanography (147Sm/144Nd,null,null,dimensionless,null,paleoceanography,null,null,N,CaCO3-free silt) earth science/paleoclimate/paleoceanography (sand,dry sediment,null,weight percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (silt,dry sediment,null,weight percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (neodymium,null,null,parts per million,null,paleoceanography,null,isotope dilution mass spectrometry,N,CaCO3-free silt) earth science/paleoclimate/paleoceanography (samarium,null,null,parts per million,null,paleoceanography,null,isotope dilution mass spectrometry,N,CaCO3-free silt) earth science/paleoclimate/paleoceanography (206Pb/204Pb,null,null,dimensionless,null,paleoceanography,null,thermal ionization mass spectrometry,N,CaCO3-free silt) earth science/paleoclimate/paleoceanography (longitude,null,null,degree west,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (143Nd/144Nd,null,null,dimensionless,null,paleoceanography,null,thermal ionization mass spectrometry,N,CaCO3-free silt) earth science/paleoclimate/paleoceanography (143Nd/144Nd,null,two standard error,dimensionless,null,paleoceanography,null,thermal ionization mass spectrometry,N,CaCO3-free silt) earth science/paleoclimate/paleoceanography (epsilon neodymium,null,null,epsilon unit,null,paleoceanography,null,null,N,CaCO3-free silt; units relative to CHUR 143/144 Nd) earth science/paleoclimate/paleoceanography (207Pb/204Pb,null,null,dimensionless,null,paleoceanography,null,thermal ionization mass spectrometry,N,CaCO3-free silt) earth science/paleoclimate/paleoceanography (208Pb/204Pb,null,null,dimensionless,null,paleoceanography,null,thermal ionization mass spectrometry,N,CaCO3-free silt) earth science/paleoclimate/paleoceanography (strontium,null,null,parts per million,null,paleoceanography,null,isotope dilution mass spectrometry,N,CaCO3-free silt) earth science/paleoclimate/paleoceanography (rubidium,null,null,parts per million,null,paleoceanography,null,isotope dilution mass spectrometry,N,CaCO3-free silt) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,sample field code) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (latitude,null,null,degree north,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean (MD99-2227>LATITUDE 58.21>LONGITUDE -48.37) Varying levels of boreal summer insolation and associated Earth system feedbacks led to differing climate and ice-sheet states during late-Quaternary interglaciations. In particular, Marine Isotope Stage (MIS) 11 was an exceptionally long interglaciation and potentially had a global mean sea level 6 to 13 metres above the present level around 410,000 to 400,000 years ago, implying substantial mass loss from the Greenland ice sheet (GIS). There are, however, no model simulations and only limited proxy data to constrain the magnitude of the GIS response to climate change during this 'super interglacial', thus confounding efforts to assess climate/ice--sheet threshold behaviour and associated sea-level rise. Here we show that the south GIS was drastically smaller during MIS11 than it is now, with only a small residual ice dome over southernmost Greenland. We use the strontium-neodymium-lead isotopic composition of proglacial sediment discharged from south Greenland to constrain the provenance of terrigenous silt deposited on the Eirik Drift, a sedimentary deposit off the south Greenland margin. We identify a major reduction in sediment input derived from south Greenland's Precambrian bedrock terranes, probably reflecting the cessation of subglacial erosion and sediment transport as a result of near-complete deglaciation of south Greenland. Comparison with ice-sheet configurations from numerical models suggests that the GIS lost about 4.5 to 6 metres of sea-level-equivalent volume during MIS11. This is evidence for late-Quaternary GIS collapse after it crossed a climate/ice-sheet stability threshold that may have been no more than several degrees above pre-industrial temperatures. STUDY NOTES: Sr-Nd-Pb isotope geochemistry on the 0.1M HCl-leached silt fraction of marine sediment core MD99-2227. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Reyes, A.V. Investigator : Carlson, A.E. Investigator : Beard, B.L. Investigator : Hatfield, R.G. Investigator : Stoner, J.S. Investigator : Winsor, K. Investigator : Welke, B. Investigator : Ullman, D.J. 2014-06-26 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/16436 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/reyes2014/reyes2014stream.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/reyes2014/reyes2014md99-2227.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/reyes2014/reyes2014stream.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/reyes2014/reyes2014md99-2227.txt English https://www.ncdc.noaa.gov/paleo/study/16436 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/reyes2014/reyes2014stream.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/reyes2014/reyes2014md99-2227.txt Reyes, A.V.; Carlson, A.E.; Beard, B.L.; Hatfield, R.G.; Stoner, J.S.; Winsor, K.; Welke, B.; Ullman, D.J.2014South Greenland ice-sheet collapse during Marine Isotope Stage 11Nature5107506525-52810.1038/nature13456http://www.nature.com/nature/journal/v510/n7506/full/nature13456.html START YEAR: 426800 cal yr BP * END YEAR: 391300 cal yr BP -48.37 58.21 -48.37 58.21